Improvement in core-bars for forming cores for casting pipes



UNITED STATES PATENT OFFICE.

GEORGE PEAOOOK, or WEsr TROY, nnwwonir.

IMPROVEMENT IN CORBBARS FOR FORIVIING CORES FOR CASTING PIPES.

Specification forming part of Letters Patent- No. 9,577, dated February8, i553.

To all whom t may concern-,.-

Be it known that I, GEORGE PEACOOK, of West Troy, in the county ofAlbany and State of New York, have invented a new and useful Improvementin Pipe-Molding, said improve- Vnient consisting in a core-har aroundwhich the sand is packed and forms the core; and I do hereby declarethat the following is a full, clear, and exact description ofthe saine,reference being had to the annexed drawings, making a part of thisspeciiication, in Which- Figure l is a perspective view of the corebar.Fig. 2 is a plan or top View ofthe corebar placed in a coreboX. Fig. 3is a perspective View of the core, showing the manner in which theupperhalt' of the core is rounded or linished by the sweep. Fig. 4 aresections 'showingthe manner in which the core-bars are jointed orconnected in order toform cores for branch pipes, elbows, Stc.- Fig.5shows the manner in which the core-bar is anchored or prevented frombeing raised by the melted inet-al. Fig. G is a plan or top view of twocoreboxes intersecting each other, with the core-bars placed in them andjointed. This View shows clearly the facility with which cores may be'formed for elbows, branch pipes, Src.

Similar letters of reference indicate corre sponding parts in each ofthe several iigures.

The nature of my invention consists in provid-ingalozenge-shaped ironbar having semicircular or other shaped wings or projections on itslower half. Said bar, which Iterm the core-bar,7 is fitted within acore-box, and the sand packed and adjusted around it, the wings orseinicircnlar projections binding the sand and causing it to adhere tothe lower portion of the bar. The sand is placed over the upper portionofthe bar and rounded or shaped perfectly semicircular by means of asweep.

. The bar, when properly encompassed by the sand, forms the core. Thecore-bar may be so arranged, as will be presently shown, as to beadapted to form coresfor elbows, branch pipes, Src., and may also beproperly anchored, so as to allow pipes of any desired length to becast.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and the manner in which the core isformed both for straight and branch pipes.

A, Figs. 2 and 3, represents a core-box, which is merely the half of apipe cut longitudinally through its center, and which serves .the placeof an ordinary pattern.

B, Figs. l and 2, is the core-bar, formed of a lozenge-shaped bar havinga series of semicircular wings or projections, a, placed transversely onits lower half.

l) D are collars. One only is seen in Figs. l and 2. These collars areplaced on the corebar, one at each end, and turned to fit the corebox A,or to be ofthe size required for the pipe intended to be cast.

E E are vent-rods, which rest upon the upper surfaces of the wings, oneon each side of the bar.

F F are cylindrical handles by which the core-bar is lifted or raisedwhen necessary.

will now proceed to show the manner in which the core is formed. Thecore-box A is of the size and form of the pipe intended to be cast. This(the core box) is properly adjusted in the sand and the core-bar placedin it,as shown in Fig. 2, the corebar corresponding in shape to thecore-boX-that is, any portions of the pipe that are larger in diameterthan another are opposite proportionally larger wings. (See the end bot' the core-box and wings a in Fig. 2.) The corebar being adj usted orplaced within the corebox, green sand is packed or pressed all aroundthe lower half of the core-bar, and between the wings a, thus forming aperfectv halfeylinder ot' sand on the lower halt' of the core-bar. Thisbeing accomplished, the upper part or surface of the core'bar is coveredwith green sand, and piled up till it reaches a necessary height. Asweepor gage, G, Fig. 3, of semicircular shape, is then drawn over the sandon the upper part of the core-bar, by which gage the-superiiuous sand isremoved or scraped off, forming a perfect cylindrical core. (See X, Fig.3.) The sweep or gageG has small recesses or shoulders c, Fig. 3, whichrest upon the upper edges of the core-box, and serve as guides as thesweep is drawn along. The larger portion of the core, which ts the partb of the core-box, is swept or rounded by a larger-sized sweep than theone G, represented. The core being now formed, the vent-rods E E arewithdrawn, whereby vent-holes are left in the core for the escape of gasand steam' while the liquid metal is being poured into the mold. Thecore is lifted or raised from the core-box by means of the handles F F,the wings a binding and holding the sand to the lower part ofthe core.The core is then adjusted in the mold,(the corebox of course beingremoved,) the collars D on the ends of the core-bar resting on the endsof the iiask. Any length of pipe may be cast in this way, for the coremay be anchored or prevented from raising by means of metal strips orbridges Ijl. One is represented in Fig. 5. These strips or bridges fitin recesses cut in the upper part of the core-bar, and rest upon woodensupports d d. These recesses are made at suitable distances apart, andcorrespond in length to the bridges, the bridges fitting loosely in themand resting upon the supports. An anchor or rod, m, rests or bears uponthe upper part of the bridge, the opposite end of the anchor beingsecured to some permanent support. Vhen the liquid metal is poured intothe mold, the anchors prevent the metal from forcing up the core. Aftera certain time the wooden supports d al burn out, and the strip orbridge will fall in the re-V cess and the core may be withdrawn. The endof the anchor that remains in the pipe is then cut off. Any numberofthesebridges may be employed, according to the length of the pipe. Theupper part of the core-barthat is, the triangular portion-is not quiteas high or as deep as the lower portion, to which the wings areattached. This is for the purpose of allowing the core to be easilywithdrawn from the pipe after it is cast.

The core-bar in present use is formed of a hollow cylinder covered withsmall projections or knobs. This core-bar is placed on a pair oftrestles and the sand pressed or packed upon the bar. A second personthen revolves or turns the bar, and the superfluous sand is taken oif bya gage or board, similar to arest for a lathe. This is a slow anduncertain process and can only 4be applied for the casting of shortpipe. Any length of pipe may be east by forming the core in my improvedmanner, and pipe may be cast of any desired thickness. The pipes cast bythe inventor will sustain a pressure of five hundred pounds to thesquare inch.

My improvement may be applied to the casting of any kind of pipe,lamp-posts, bridgetubing, and the like. The projections or wings a, ofcourse, may vary in shape, according to the shape ofthe article to becast. For instance, for round pipes the wings are semieircular, forheXagon pipes the wings would be three-sided or half-hexagon, 81e. Incase of elbows or branch pipes l joint the corebars,"as will be readilyunderstood by referring to Figs. 4 and 6. Suppose l, Fig. 6, to be amain pipe, and J a branch pipe intersecting the main pipe'at rightangles. I and J, I will also call eore-boxes. Kis the'corebar of themain core-box I, and L is the corebar of the branch core-box J. Thecore-bar L is jointed to the core-barKin the following manner: The bar Lis formed of two parts,

and one end of each part is connected at opposite sides of the bar K,the two parts of the bar L being inline. The ends of each part of thebar Ldt between two wings, a a, on the barfK, and a recess, e, is madein Ithe inner sides of one of the Wings, in which a projection, f, ofcorresponding size, on the side of the bar L and at itsV end, fits. Thisprojection is secured in the recess e by means of a wooden Wedge, g,which is driven tightly between the bar L and the adjoining wings. Vhenthe core is formed and adjusted in the mold, the liquid metal burns outthe wedges, and the core-bars become detached from each other and may bereadily Withdrawn.

The old bars having the projecting knobs could not be used similar to mybar with the .transverse wings, because they could not be rammed andwell packed. This is evident, for a series of knobs, even if placed inregular order upon a half-cylinder, would have spaces between thembeyond the reach ofthe ram mer. My bar, when placed in the mold, has aseries of transverse apertures formed bythe semi-- circular wings, andthe sand in each aperture may be thoroughly rammed, there being nochance for the sand to give or spread lengthwise of the bar, for thewings serve as partitions, whereas if knobs were employed the sand wouldspread, whenrainmed, lengthwise of the rod and between the knobs, therebeing no perfect partition atany point on the bar.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, isl l. The core-bar B, having transverse wingsor projections a, of seniicircular or other shape, corresponding to theshape of the article to be cast, said wings or projections permittingthe sand to be rammed, for forming the lower half of the core andholding or binding the sand to the lower part ofthe bar, and allowingthe upper half ofthe core to be made by the sweep, as herein set forth.

2. The manner of anchoring the core-bar as herein described-viz., bymeans of the metal strips or bridges H, fitting in recesses in the uppersurface of the core-bar, said bridges resting upon wooden supports d d,and having anchor-rods bearing upon their upper surfaces, the liquidmetal burning out the wooden supports and allowing the core to bewithdrawn, by which means the core is prevented from being raised orforced upward by the liquid metal as it is poured into the mold, andthus enabling pipes to be cast of any desired length.

8. The manner, substantially as herein de scribed, of connecting orjointing the corebars for forming cores for elbows or branch pipes-viz.,by means of wooden wedges g g, which are the means of holding the barsto gether while the core is being-formed, said Wedges being burned outby the liquid metal when poured into the mold and allowing the cores tobe withdrawn.

GEORGE PEACOCK.

Vtnesses:

H. J. HAsrINGs, PETER JoHNsoN.

